diff --git a/spec/validator_spec.js b/spec/validator_spec.js
index ea07bc14..c282415f 100644
--- a/spec/validator_spec.js
+++ b/spec/validator_spec.js
@@ -129,6 +129,12 @@ describe("XML Validator", function () {
         });
     });
 
+    it("should not validate xml with unexpected closing tag", function () {
+        validate("</rootNode>", {
+            InvalidTag: "Closing tag 'rootNode' has not been opened."
+        });
+    });
+
     it("should validate xml with comment", function () {
         validate("<rootNode><!-- <tag> - - --><tag>1</tag><tag>val</tag></rootNode>");
     });
diff --git a/src/validator.js b/src/validator.js
index 11b051b1..3b1b2efb 100644
--- a/src/validator.js
+++ b/src/validator.js
@@ -103,6 +103,8 @@ exports.validate = function (xmlData, options) {
             return getErrorObject('InvalidTag', "Closing tag '"+tagName+"' doesn't have proper closing.", getLineNumberForPosition(xmlData, i));
           } else if (attrStr.trim().length > 0) {
             return getErrorObject('InvalidTag', "Closing tag '"+tagName+"' can't have attributes or invalid starting.", getLineNumberForPosition(xmlData, tagStartPos));
+          } else if (tags.length === 0) {
+            return getErrorObject('InvalidTag', "Closing tag '"+tagName+"' has not been opened.", getLineNumberForPosition(xmlData, tagStartPos));
           } else {
             const otg = tags.pop();
             if (tagName !== otg.tagName) {